Switch Azure DB tests from GP_Gen4_2 to B_Gen5_1.

Also switch from uswest to uswest2.

GP_Gen4_2 is more expensive and is no longer available in all regions.
The uswest location is also more expensive than uswest2.

This is a bug fix since GP_Gen4_2 is no longer available in uswest.

Applying this fix directly to older stable branches as the tests have
changed significantly in devel.

test/integration/targets/azure_rm_mysqldatabase/tasks/main.yml

@@ -8,9 +8,9 @@
     resource_group: "{{ resource_group }}"
     name: mysqlsrv{{ rpfx }}
     sku:
-      name: GP_Gen4_2
+      name: B_Gen5_1
-      tier: GeneralPurpose
+      tier: Basic
-    location: westus
+    location: westus2
     storage_mb: 51200
     version: 5.6
     enforce_ssl: True

test/integration/targets/azure_rm_postgresqldatabase/tasks/main.yml

@@ -8,9 +8,9 @@
     resource_group: "{{ resource_group }}"
     name: postgresqlsrv{{ rpfx }}
     sku:
-        name: GP_Gen4_2
+        name: B_Gen5_1
-        tier: GeneralPurpose
+        tier: Basic
-    location: westus
+    location: westus2
     storage_mb: 51200
     enforce_ssl: True
     admin_username: zimxyz